Learning tool



FIG. 1 is a perspective view of a learning tool showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof, the right side being a mirror image; and,

FIG. 5 is a top plan view thereof, the bottom plan view being a mirror image.

The broken lines shown in the drawings illustrating unclaimed environmental structures form no part of the claimed design. 

CLAIM The ornamental design for a learning tool, as shown and described. 